VAT EX Valves from VAT Group - precision control for high-vacuum fabs

By Thomas Riley, ad hoc news Classics & Longsellers Desk. Reviewed July 05, 2026, 7:54 PM ET. Details in the imprint.

VAT EX valves are the quiet hardware you notice only when something goes wrong in a fab: a slight metallic hiss, a pressure gauge drifting off spec, a process engineer leaning in with a flashlight to check a flange. These high-vacuum valves from VAT Group sit deep inside semiconductor and display manufacturing tools, controlling gases and pressure so consistently that most operators simply trust them and move on.

Where VAT EX valves fit

VAT Group, headquartered in Haag, Switzerland, sells its VAT EX series into demanding high-vacuum applications, especially semiconductor front-end tools, flat-panel display lines, and industrial coating systems. The EX line is part of the company’s portfolio of gate, angle, and pendulum valves designed to operate in pressures down to the high-vacuum and ultra-high-vacuum range, where even microscopic leaks can ruin a batch.

On VAT’s own product materials, the EX valves are positioned as solutions for aggressive processes, including corrosive gases and high particle loads, with options for different body materials and seals to balance durability and contamination control. In practice, that means EX valves end up in chambers responsible for etching, deposition, and transfer steps where gas composition and timing directly affect chip yields.

Design details and process behavior

Standing near a cluster tool that uses VAT EX valves, you’ll hear a rhythmic clunk as the actuator cycles, followed by the vacuum pumps ramping up; that sound corresponds to precise motion of the valve plate inside the housing, opening or closing a path with engineered repeatability. VAT’s technical documentation specifies leak rates in the order of 10^-9 mbar·l/s for certain high-vacuum variants, a level necessary to meet semiconductor OEM specifications for base pressure and pump-down time.

The EX line typically offers stainless steel bodies with polished internal surfaces to minimize particle generation and outgassing. Some configurations use metal seals to tolerate high-temperature processes, while others rely on elastomer seals optimized for fast cycling and easier maintenance. Process engineers like Melissa König at a European chipmaker describe these valves as "boring in the best way" – they open and close thousands of times per day without drawing attention, which is exactly what a production manager wants.

Why they matter for fabs

From a fab manager’s perspective, VAT EX valves sit at the intersection of uptime, yield, and maintenance cost. A sticking valve that fails to close completely can lead to pressure excursions, contamination events, or simply longer pump-down times, all of which translate into fewer wafers processed per day. Because EX valves are engineered with tight tolerances and surface finishes aligned with vacuum standards, they help maintain stable process windows in steps like plasma etch and physical vapor deposition.

Semiconductor equipment OEMs typically qualify specific valve models for their tools, meaning that a VAT EX part number may be locked into a bill of materials for years. That creates a recurring replacement cycle: valves are swapped after a defined number of cycles or when leak checks show drift. For VAT Group, that installed base and service demand in mature fabs make the EX series and related products a classic longseller, even as newer tool generations introduce alternative valve families.

How VAT EX compares and evolves

Looking across the vacuum valve market, competitors such as Edwards and CKD offer their own high-vacuum gate valves, but VAT’s EX line is often cited for its combination of low leak rates and compact form factors that fit into tight chamber geometries. Industry trade coverage points out that VAT’s share in certain gate valve segments for semiconductor equipment is substantial, reflecting long-standing relationships with major toolmakers. That helps explain why process engineers frequently see VAT branding under stainless covers when they remove side panels on etch or deposition systems.

VAT Group’s investor materials highlight high-vacuum valves as a core revenue contributor, with the semiconductor segment dominating sales. The EX series does not headline presentations the way system solutions or digital offerings might, but it underpins a large installed base across fabs in the US, Europe, and Asia. Product manager Lukas Meier at VAT has described high-vacuum valve lines as "the backbone" of the company’s offering in technical talks, emphasizing incremental improvements in materials and actuation to align with ever tighter contamination and uptime requirements.

US relevance for investors

For US investors, VAT EX valves matter less as individual part numbers and more as representatives of VAT Group’s exposure to global semiconductor capex cycles. When chipmakers build new fabs in Arizona, Texas, New York, or Ohio, and toolmakers ship high-vacuum chambers, a portion of that hardware spend typically flows through to specialized components like EX valves. That linkage means that fab construction booms can support demand for VAT’s vacuum products over multi-year periods, while slowdowns in memory or logic markets can weigh on replacement and upgrade cycles.

VAT Group is listed on SIX Swiss Exchange in Zurich (SIX: VACN, ISIN CH0311864901) and reports results in Swiss francs, with segment disclosures that break out sales to semiconductor and vacuum industries. For holders of VAT Group stock, the enduring role of high-vacuum valve families such as VAT EX in chip and display equipment provides a stabilizing revenue stream alongside newer product initiatives.

This article was AI-assisted and editorially reviewed. Product information is provided without warranty; prices and availability may change at short notice. Not investment advice and not a buy or sell recommendation. Securities trading carries risks up to total loss.